/u/ETFO's posts in /r/askscience
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Does any transparent gas in large enough quantities appear blue when shined with white light (for the same reason the sky appears blue)?
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How can things enter the event horizons of black holes if all directions within an event horizon point inward?
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How can things enter the event horizons of black holes if all directions within an event horizon point inward?
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If you could somehow move faster than the speed of light, and somehow ended up inside the event horizon of a black hole, which direction would you face to exit?
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